MAX1642 Datasheet, PDF (3/12 Pages) Maxim Integrated Products – High-Efficiency, Step-Up DC-DC Converters for 1V Inputs

High-Efficiency, Step-Up
DC-DC Converters for 1V Inputs
ELECTRICAL CHARACTERISTICS
(V_BATT = V_SHDN = 1.3V, I_LOAD = 0mA, FB = GND, T_A = -40°C to +85°C, unless otherwise noted.) (Note 4)
PARAMETER
SYMBOL
CONDITIONS
MIN
Output Voltage
V_OUT
V_FB < 0.1V
2.99
FB Set Voltage
V_FB
External feedback
1.11
N-Channel On-Resistance
V_OUT = 3.3V
P-Channel On-Resistance
V_OUT = 3.3V
On-Time Constant
K
0.9V < V_BATT < 1.5V (t_ON = K / V_BATT)
12.4
Quiescent Current into OUT
I_QOUT
V_OUT = 3.5V
Quiescent Current into BATT
I_QBATT
Shutdown Current into OUT
I_SHDN,OUT V_OUT = 3.5V (MAX1642)
Shutdown Current into BATT
I_SHDN,BATT V_BATT = 1.0V (MAX1642)
PFI Trip Voltage
Falling PFI, hysteresis = 1%
550
BATTLO Trip Voltage
Falling V_BATT, V_OUT = 3.3V, hysteresis = 2%
(MAX1643)
0.93
MAX
3.56
1.32
1.5
2.2
38.2
18
6.5
1
3.5
662
1.06
UNITS
V
V
Ω
Ω
V-µs
µA
µA
µA
µA
mV
V
Note 2: Start-up guaranteed by correlation to measurements of device parameters (i.e., switch on-resistance, on-times, off-times, and
output voltage trip points).
Note 3:
t_OFF
=


t_ON
V_OUT
x V_BATT
- V_BATT


x
RATIO.
This
guarantees
discontinuous
conduction.
Note 4: Specifications to -40°C are guaranteed by design, not production tested.
__________________________________________Typical Operating Characteristics
(Circuit of Figure 4, V_BATT = 1.2V, R1 + R2 = 1MΩ, T_A = +25°C, unless otherwise noted.)
EFFICIENCY vs. OUTPUT CURRENT
(V_OUT = 2.4V)
100
90
V_IN = 1.6V
80
70
60
50
40
V_IN = 1.0V ^{VIN = 1.2V}
30
V_IN = 0.85V
20
10 ^{L1 = 100µH}
SUMIDA CD54-101
0
0.01
0.1
1
10
100
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
(V_OUT = 2.4V)
100
90
V_IN = 1.6V
80
70
60
50
40
V_IN = 1.0V ^{VIN = 1.2V}
30
V_IN = 0.85V
20
10 ^{L1 = 150µH}
TDK NLC565050T-151K
0
0.01
0.1
1
10
100
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
(V_OUT = 3.3V)
100
90
V_IN = 1.6V
80
70
60
50
40
V_IN = 1.0V
V_IN = 1.2V
30
V_IN = 0.85V
20
10 ^{L1 = 100µH}
SUMIDA CD54-101
0
0.01
0.1
1
10
100
OUTPUT CURRENT (mA)
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